In a startling new collection, previously undisclosed to the public, photographs and charts chronicling German air raids on Britain during the First World War are among dozens of other documents released from the archives held by the Imperial War Museum, London. The collection is being revealed within a new book, Mapping the First World War, by Dr Peter Chasseaud, a historian of military cartography. In his book, he demonstrates the importance of maps in helping to understand the development of aerial combat during this period in history.